WLC only connects to MACs, Androids, but not to Windows PCs since today

Since today we have a curious "feature":
Only MAC and Android clients are able to connect to the WLAN, locked by WPA2-enterprise/Radius (Windows domain server with NAS). Windows clients are denied.
Does anyone have the same epxeriences?
Markus

I found the solution after sveral hours of searching in google and the log-files of the NPS:
http://support.microsoft.com/kb/933430/en-us
Our NPS-Server contains to many entries in the trusted root certification list!!!
I tried to delete several certificates, but as you can see in http://support.microsoft.com/kb/293781 this can be very critical, since I don#t know, which certificates are needed for the system
So I used Method #3 in http://support.microsoft.com/kb/933430/en-us afterwards and now it seems, that all clients can connect again.
Markus

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